Hooray! A future art teacher! I understand your question of wanting it all...to be an artist and a teacher, and a teacher and an artist. It's kind of what most art teachers want. We wouldn't be much use as an art teacher if we didn't create our own art, but how to balance our own art making with our teaching?
I hope you find employment as an art teacher in a school district that pays you a good salary, and provides you with benefits, and supports the Arts programs in its schools. I know this is not always the case, and you, like many other teachers, might need to get a side or summer job to help pay the bills. It makes sense for you to think about an art related job.
The thing is, teaching, if you really care about your job and your students, is pretty intense, especially for the first 4 years. A novice teacher is expected to operate pretty much at the same level as the teacher he or she replaced, who might have been on the job for 20-30 years. The first years can be overwhelming at times.
To give you an idea, here was my typical day. I got to school between 6:30 and 6:45 AM to get things ready for my classes, (7th grade art, 8th grade art, advanced art), read and reply to email, load the kiln, get out supplies, cue up Powerpoints, and so on. My students would arrive at 7:30, and the day would begin; I'd have half an hour for lunch and a planning period a day, during which I would grade artwork and other papers; load/unload the kiln; order supplies; unpack and store supplies; take work off display and put work on display; work on lesson plans and Powerpoint presentations; set up teaching displays and teaching examples of artwork; contact parents; and prep supplies (counting paintbrushes, cutting paper, getting out paint, and so on). After the students left at 2:30, it would be more of the same, plus faculty and departmental meetings, plus working with students after school and running an art club one day a week. I would be happy if I got out by 4:00 PM. Then it would be, drive home, cook dinner and maybe do some grading of quizzes or other papers, and some more planning. In bed by 9:30 PM to do it all over again the next day. I think you get the idea that having time in the evening for my own artwork was difficult to find. The weekends were better, but then there were the household distractions...cleaning, grocery shopping, and so on. All of this does not take into consideration having a social life or a family......
I don't mean to discourage you, I loved my job and would do it again in a heartbeat if I was a young person. But to be able to keep up with your own artwork is a challenge, and you have to be really disciplined. I found I if I did not have the energy for my painting, I could do beading and block prints in the evenings and on the weekends. I did not sell them before I retired, but in retrospect, I think I could have, (but not in my first 3 years). Now, as a retired teacher, I sell my beads online, and my prints at craft fairs. Beware that the business side of selling your artwork is its own challenge, and it will take some time and energy to get it set up, but it is doable. I have not made much money from it, but I find it very satisfying to have my work out there.
Now that there are online platforms like Etsy and others, it is easier to sell your work online. Etsy has a whole section for setting up your " etsy shop", which is very helpful for general art entrepreneurship advice. There are pages and pages on Pinterest about selling your artwork. You might also check out some community art galleries where you can show and sell your work. Check out local craft fairs; attend one and ask some of the vendors about selling art work (if they are not too busy!). You might also check out some community art centers that offer classes and see about teaching there on weekends or during the summers. You could also consider offering private art lessons to adults or children, either at their homes or at yours.
I hope this helps. Best wishes on your future career as an art teacher and as an artist.